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Discharge deficits in the Central Himalaya linked to greening and warming
Taylor Smith1, Bodo Bookhagen2
1Institute of Geosciences, Universität Potsdam, Potsdam, Germany. tasmith@uni-potsdam.de.
Abstract:
Anthropogenic climate change and rapid infrastructure development have drastically altered the hydrology of many watersheds, influencing the rate at which water is absorbed, stored, and distributed. In this work, we use long-term daily discharge records in the Central Himalaya alongside rainfall and snowmelt data to explore whether there have been large-scale shifts in the conversion of upstream water into discharge throughout the region. We find that, for the majority of watersheds studied over decadal time scales (∼1960s to 2024), both rainfall and snowmelt are taking longer to be converted into discharge. We link these changes to increasing water storage deficits, where relatively more surface water is being diverted to soil moisture, vegetation uptake, and deeper water storage reservoirs. We propose that large-scale climate change and vegetation greening have modified catchment-level precipitation-discharge relationships in the Central Himalaya.
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